Yup, gotta agree with everything everyone has said so far.
Supers can come from a very wide variety of sources. For generic 'make your own' heroes
You can't beat Crossover! They are also very painter friendly in design, which helps.
Just one other thing to add, a few firms such as hassle free produce sculpting 'dollies',
Basically unclothed figures. These are great for heroes or villains wearing skin tight costumes,
and if your green stuff skills are up to it you can add your own capes, masks etc.
Regards
Jim